diff --git a/backport-Fix-write-after-free-in-DHCPv6-code-CVE-2022-0934.patch b/backport-Fix-write-after-free-in-DHCPv6-code-CVE-2022-0934.patch new file mode 100644 index 0000000..1463323 --- /dev/null +++ b/backport-Fix-write-after-free-in-DHCPv6-code-CVE-2022-0934.patch @@ -0,0 +1,166 @@ +Subject: [PATCH] backport Fix write-after-free error in DHCPv6 code + CVE-2022-0934 refers + +Reference:https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=03345ecefe +--- + src/rfc3315.c | 44 +++++++++++++++++++++++++------------------- + 1 file changed, 25 insertions(+), 19 deletions(-) + +diff --git a/src/rfc3315.c b/src/rfc3315.c +index 16ce2ca..cdb4b64 100644 +--- a/src/rfc3315.c ++++ b/src/rfc3315.c +@@ -33,9 +33,9 @@ struct state { + unsigned int mac_len, mac_type; + }; + +-static int dhcp6_maybe_relay(struct state *state, void *inbuff, size_t sz, ++static int dhcp6_maybe_relay(struct state *state, unsigned char *inbuff, size_t sz, + struct in6_addr *client_addr, int is_unicast, time_t now); +-static int dhcp6_no_relay(struct state *state, int msg_type, void *inbuff, size_t sz, int is_unicast, time_t now); ++static int dhcp6_no_relay(struct state *state, int msg_type, unsigned char *inbuff, size_t sz, int is_unicast, time_t now); + static void log6_opts(int nest, unsigned int xid, void *start_opts, void *end_opts); + static void log6_packet(struct state *state, char *type, struct in6_addr *addr, char *string); + static void log6_quiet(struct state *state, char *type, struct in6_addr *addr, char *string); +@@ -105,12 +105,12 @@ unsigned short dhcp6_reply(struct dhcp_context *context, int interface, char *if + } + + /* This cost me blood to write, it will probably cost you blood to understand - srk. */ +-static int dhcp6_maybe_relay(struct state *state, void *inbuff, size_t sz, ++static int dhcp6_maybe_relay(struct state *state, unsigned char *inbuff, size_t sz, + struct in6_addr *client_addr, int is_unicast, time_t now) + { + void *end = inbuff + sz; + void *opts = inbuff + 34; +- int msg_type = *((unsigned char *)inbuff); ++ int msg_type = *inbuff; + unsigned char *outmsgtypep; + void *opt; + struct dhcp_vendor *vendor; +@@ -260,15 +260,15 @@ static int dhcp6_maybe_relay(struct state *state, void *inbuff, size_t sz, + return 1; + } + +-static int dhcp6_no_relay(struct state *state, int msg_type, void *inbuff, size_t sz, int is_unicast, time_t now) ++static int dhcp6_no_relay(struct state *state, int msg_type, unsigned char *inbuff, size_t sz, int is_unicast, time_t now) + { + void *opt; +- int i, o, o1, start_opts; ++ int i, o, o1, start_opts, start_msg; + struct dhcp_opt *opt_cfg; + struct dhcp_netid *tagif; + struct dhcp_config *config = NULL; + struct dhcp_netid known_id, iface_id, v6_id; +- unsigned char *outmsgtypep; ++ unsigned char outmsgtype; + struct dhcp_vendor *vendor; + struct dhcp_context *context_tmp; + struct dhcp_mac *mac_opt; +@@ -297,11 +297,12 @@ static int dhcp6_no_relay(struct state *state, int msg_type, void *inbuff, size_ + v6_id.next = state->tags; + state->tags = &v6_id; + +- /* copy over transaction-id, and save pointer to message type */ +- if (!(outmsgtypep = put_opt6(inbuff, 4))) ++ start_msg = save_counter(-1); ++ /* copy over transaction-id */ ++ if (!put_opt6(inbuff, 4)) + return 0; + start_opts = save_counter(-1); +- state->xid = outmsgtypep[3] | outmsgtypep[2] << 8 | outmsgtypep[1] << 16; ++ state->xid = inbuff[3] | inbuff[2] << 8 | inbuff[1] << 16; + + /* We're going to be linking tags from all context we use. + mark them as unused so we don't link one twice and break the list */ +@@ -348,7 +349,7 @@ static int dhcp6_no_relay(struct state *state, int msg_type, void *inbuff, size_ + (msg_type == DHCP6REQUEST || msg_type == DHCP6RENEW || msg_type == DHCP6RELEASE || msg_type == DHCP6DECLINE)) + + { +- *outmsgtypep = DHCP6REPLY; ++ outmsgtype = DHCP6REPLY; + o1 = new_opt6(OPTION6_STATUS_CODE); + put_opt6_short(DHCP6USEMULTI); + put_opt6_string("Use multicast"); +@@ -620,11 +621,11 @@ static int dhcp6_no_relay(struct state *state, int msg_type, void *inbuff, size_ + struct dhcp_netid *solicit_tags; + struct dhcp_context *c; + +- *outmsgtypep = DHCP6ADVERTISE; ++ outmsgtype = DHCP6ADVERTISE; + + if (opt6_find(state->packet_options, state->end, OPTION6_RAPID_COMMIT, 0)) + { +- *outmsgtypep = DHCP6REPLY; ++ outmsgtype = DHCP6REPLY; + state->lease_allocate = 1; + o = new_opt6(OPTION6_RAPID_COMMIT); + end_opt6(o); +@@ -811,7 +812,7 @@ static int dhcp6_no_relay(struct state *state, int msg_type, void *inbuff, size_ + int start = save_counter(-1); + + /* set reply message type */ +- *outmsgtypep = DHCP6REPLY; ++ outmsgtype = DHCP6REPLY; + state->lease_allocate = 1; + + log6_quiet(state, "DHCPREQUEST", NULL, ignore ? _("ignored") : NULL); +@@ -926,7 +927,7 @@ static int dhcp6_no_relay(struct state *state, int msg_type, void *inbuff, size_ + int address_assigned = 0; + + /* set reply message type */ +- *outmsgtypep = DHCP6REPLY; ++ outmsgtype = DHCP6REPLY; + + log6_quiet(state, msg_type == DHCP6RENEW ? "DHCPRENEW" : "DHCPREBIND", NULL, NULL); + +@@ -1061,7 +1062,7 @@ static int dhcp6_no_relay(struct state *state, int msg_type, void *inbuff, size_ + struct dhcp_config *find_config = NULL; + + /* set reply message type */ +- *outmsgtypep = DHCP6REPLY; ++ outmsgtype = DHCP6REPLY; + + log6_quiet(state, "DHCPCONFIRM", NULL, NULL); + +@@ -1151,7 +1152,7 @@ static int dhcp6_no_relay(struct state *state, int msg_type, void *inbuff, size_ + log6_quiet(state, "DHCPINFORMATION-REQUEST", NULL, ignore ? _("ignored") : state->hostname); + if (ignore) + return 0; +- *outmsgtypep = DHCP6REPLY; ++ outmsgtype = DHCP6REPLY; + tagif = add_options(state, 1); + break; + } +@@ -1160,7 +1161,7 @@ static int dhcp6_no_relay(struct state *state, int msg_type, void *inbuff, size_ + case DHCP6RELEASE: + { + /* set reply message type */ +- *outmsgtypep = DHCP6REPLY; ++ outmsgtype = DHCP6REPLY; + + log6_quiet(state, "DHCPRELEASE", NULL, NULL); + +@@ -1225,7 +1226,7 @@ static int dhcp6_no_relay(struct state *state, int msg_type, void *inbuff, size_ + case DHCP6DECLINE: + { + /* set reply message type */ +- *outmsgtypep = DHCP6REPLY; ++ outmsgtype = DHCP6REPLY; + + log6_quiet(state, "DHCPDECLINE", NULL, NULL); + +@@ -1305,6 +1306,11 @@ static int dhcp6_no_relay(struct state *state, int msg_type, void *inbuff, size_ + } + + } ++ ++ /* Fill in the message type. Note that we store the offset, ++ not a direct pointer, since the packet memory may have been ++ reallocated */ ++ ((unsigned char *)(daemon->outpacket.iov_base))[start_msg] = outmsgtype; + + log_tags(tagif, state->xid); + log6_opts(0, state->xid, daemon->outpacket.iov_base + start_opts, daemon->outpacket.iov_base + save_counter(-1)); +-- +1.8.3.1 + diff --git a/dnsmasq.spec b/dnsmasq.spec index a4c13c3..d334f5a 100644 --- a/dnsmasq.spec +++ b/dnsmasq.spec @@ -1,6 +1,6 @@ Name: dnsmasq Version: 2.86 -Release: 1 +Release: 2 Summary: Dnsmasq provides network infrastructure for small networks License: GPLv2 or GPLv3 URL: http://www.thekelleys.org.uk/dnsmasq/ @@ -31,6 +31,7 @@ Patch20: backport-dnsmasq-2.86-build_server_array.patch Patch21: backport-dnsmasq-2.87-tcp-strcasecmp.patch Patch22: bugfix-allow-binding-mac-with-ipv6.patch Patch23: bugfix-deal-with-CONFRIM-when-binding-mac-with-ipv6.patch +Patch24: backport-Fix-write-after-free-in-DHCPv6-code-CVE-2022-0934.patch BuildRequires: gcc @@ -121,6 +122,12 @@ install -Dpm644 %{SOURCE2} $RPM_BUILD_ROOT%{_sysusersdir}/dnsmasq.conf %{_mandir}/man8/dnsmasq* %changelog +* Sat Jul 30 2022 renmingshuai - 2.86-2 +- Type:CVE +- Id:CVE-2022-0934 +- SUG:NA +- DESC:fix CVE-2022-0934 + * Tue Mar 22 2022 yanglu - 2.86-1 - update dnsmasq to 2.86